Do you guys trust the expiration date on the API test? I've had mine for two years and the expiration date is in 2017. I don't check my parameters very often as I keep up with my water changes. Just for the heck of it I tested it today and I'm showing 0 Nitrates. Even though it's a tank that's been established for years I had to check Ammonia and Nitrite to be sure and they were 0 as well. I've been doing two 60-70% WC's a week but I'm also power feeding, so something doesn't seem right. Last WC I did was on Monday. I've had 4 feedings since then. The bio-load isn't overly large since most of my fish are 7" and under (125g) but I would have thought some Nitrates would show up. I introduced live plants a couple of weeks ago but I have not seen any growth so I don't think that it's.